php - mysql triggers - adding id to another table from inserted row -


currently have table 'droster' has:

id - game_name - .....

i want put in information once fill out form id auto populated table 'dtraincompleted':

id - time -...

i have been tring comeup trigger allow , have not totally grasp concept , need little more advice explaination of how works don't have ask again. appreciate it..

i have trigger need make want learn how make 1 simpler making new colomn each time new training class added make colomn on dtraincomplete table..

-------------------edit-------------------------------

 id newly created row of information id other table


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